Littérature scientifique sur le sujet « Injection de glaçon »
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Thèses sur le sujet "Injection de glaçon"
Waller, Vincent. « Modélisation de la source de matière associée à l'injection d'un glaçon dans un tokamak ». Aix-Marseille 1, 2003. http://www.theses.fr/2003AIX11007.
Texte intégralNehme, Hassan. « Calcul de la source de matière effective associée à l'alimentation par injection de glaçon : application à ITER [Réacteur expérimental thermonucléaire international] ». Aix-Marseille 1, 2009. http://www.theses.fr/2009AIX11065.
Texte intégralWith increasing size and performance of present tokamaks, pellet injection has become a mandatory tool for fuelling and controlling fusion plasmas. A key element in the building of reliable scenarios for ITER is the determination of the effective source of particle associated with the injection of a pellet. Such a computation requires a thorough description of both pellet ablation and deposited material homogenization in the background plasma. The goal of this his report is the description of such a study. In the first part, which is devoted to ablation physics, we analyze the relative importance of the different processes shielding the pellet against the plasma heat flux. In the second part, which is devoted to the description of the drift of the pellet deposited material down the magnetic field gradient, we compare the measured characteristics of deposition profiles to our own simulations, showing a good agreement. This was done for data originating from different machines operating with different plasma scenarios. Then, we describe the several improvements brought to our model and demonstrate that there is a correlation between the location of the maximum of matter deposition and that of integer q-surfaces. The last part reports on the modeling of pellet injection in ITER. First we estimate the expected deposition depth of the pellet material, and the flux to be injected for pacing the ELMs and maintaining the core density. Then, we present a parametric study demonstrating that it is not possible to improve significantly the fuelling efficiency in ITER on the basis of the demonstrated performance of present injectors
Geulin, Eléonore. « Contribution to the modeling of pellet injection : from the injector to ablation in the plasma ». Electronic Thesis or Diss., Aix-Marseille, 2023. http://www.theses.fr/2023AIXM0066.
Texte intégralThe preferred method of fueling fusion device is the use of D and/or T pellets injected into the plasma. They are currently used, but the results cannot be extrapolated to future larger reactors where the design of the injection system and the construction of scenarios will be mainly based on simulations. It is therefore important to fill in the gaps in the existing models from the manufacture of pellets to the deposition of material in the plasma. Two lacks of knowledge appear: the modeling of the pellet transport in the injection pipe and the validation of the ablation process. This work aims to fill these gaps and consists of 3 parts.- Describe the physics of material deposition, then the state of the art of the main results and finally the description of the pellet injection systems planned for the next machines.- Model the transport of the pellet in the injection pipe. The effects taken into account in the model are the weakening of the ice during rebounds, the increase in its temperature and its erosion. The model gives in particular the slowing down and the loss of mass of the pellet during the journey, as well as the stored elastic energy linked to its integrity on leaving the tube.- Contribute to the validation of the HPI2 ablation code, by comparing its predictions to data measured in ablation clouds. The method used is a calculation of synthetic data sets from simulations and comparing them to measurements. This method made it possible to validate the assumptions and approximations of the ablation model
Lazare, Olivier. « Injection de glaçons de deutérium dans le tokamak TFR ». Paris 11, 1985. http://www.theses.fr/1985PA112161.
Texte intégralInjecting fresh fuel deep inside the plasma of a thermonuclear reactor appears to be necessary; the only way to do that is to inject fast solid deuterium pellets. The existing theoritical, technical and experimental aspects of this method are presented. The experiments on TFR have confirmed that injecting pellets is technically feasible; a new kind of injector is presented. The injection does not degrade stability nor confinement of the plasma. The study of the transient phenoma occuring during the injection has proved to be an efficient way to investigate particles and energy transport in the discharge; in particular, a fast transport phenomenon, similar to those occuring during disruptions, has been studied in details. Conclusions about disruptions are drawn
Picchiottino, Jean-Michel. « Injection de glaçons dans un plasma chaud de tokamak : théorie et expérience ». Aix-Marseille 1, 1994. http://www.theses.fr/1994AIX11013.
Texte intégralMAGET, PATRICK. « Injection de glacons et confinement dans le tokamak tore supra ». Paris 11, 1998. http://www.theses.fr/1998PA112228.
Texte intégralChapitres de livres sur le sujet "Injection de glaçon"
Arlt, Wiebke. « Management of Adrenal Insufficiency ». Dans Oxford Textbook of Endocrinology and Diabetes 3e, sous la direction de John A. H. Wass, Wiebke Arlt et Robert K. Semple, 911–30. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780198870197.003.0103.
Texte intégralArlt, Wiebke. « Adrenal insufficiency ». Dans Oxford Textbook of Endocrinology and Diabetes, 843–59. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780199235292.003.0599.
Texte intégralActes de conférences sur le sujet "Injection de glaçon"
Akpobi, Elohor Diamond, et Efeosa Praise Oboh. « Algorithm to Compute the Minimum Miscibility Pressure (MMP) for Gases in Gas Flooding Process ». Dans SPE Nigeria Annual International Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/211973-ms.
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